1. A two port network is represented by ABCD parameters as shown below. If port-2 is terminated by R

_{L}, the input impedance seen at port-1 is given by

**Solution:**https://www.youtube.com/watch?v=-emJQU9Qsx8

2. In the two port network shown in the figure below, Z

_{12}and Z

_{21}are respectively

**Solution:**https://www.youtube.com/watch?v=JFOPiiE7frs

3. The first and the last critical frequencies (singularities) of a driving point impedance function of a passive network having two kinds of elements, are a pole and a zero respectively. The above property will be satisfied by

a) RL network only

b) RC network only

c) LC network only

d) RC as well as RL networks

**Solution:**https://www.youtube.com/watch?v=L4AUTybSCjk

4. A 2 mH inductor with some initial current can be represented as shown below, where 's' is the Laplace Transform variable. The value of initial current is :

a) 0.5 A

b) 2.0 A

c) 1.0 A

d) 0.0 A

**Solution:**https://www.youtube.com/watch?v=145BHvtN10o

5. In the figure shown below, assume that all the capacitors are initally uncharged. If V

_{i}(t) = 10 u(t) volts, then V

_{o}(t) is given by

**Solution:**https://www.youtube.com/watch?v=oA-NdSmNq1c

6. A negative resistance R

_{neg}is connected to a passive network N having driving point impedance Z

_{1}(s) as shown below. For Z

_{2}(s) to be positive real,

**Solution:**https://www.youtube.com/watch?v=ESM5mIZBEeU